删除第一个字符串出现的第二个字符串

题目描述：

删除第一个字符串中出现的第二个字符串，比如s1：ababaabb, s2:aba，输出应为：baabb

#include <iostream>
#include <string>
using namespace std;

int main(){
	string s1, s2;
	while(cin >> s1){
		char c = getchar();
		cin >> s2;
		int pos = -1;
		while((pos = s1.find(s2)) >= 0){
			//cout << pos << endl;
			s1.erase(pos, s2.size());
			pos = -1;
		}
		cout << s1 << endl;
	}
	return 0;

}

s1.find(s2): return the position where s2 appear in s1. eg:s1 = "ababaabbab", s2 = "aab", and the result is 4;
s1.find(ch): return the position where char ch appear in s1.
s1.erase(pos, size): delete the char form pos to pos + size - 1; And return the s1 changed.
s1.erase(pos): delete from the pos until the end.